Internal Architecture

The line cards T-ONE, E-ONE, J-ONE, DS3, and VDAC-ONE (or IP Network Interface Series 2) card communicate with the Matrix Controller Series 3 over the internal HDLC bus. In addition, the IP Signaling Series 3 card and the VDAC-ONE (or IP Network Interface Series 2) card connect directly to the IP Network. The Host, IP Signaling Series 3 Card, and Matrix Controller communicate over the Ethernet LAN.

1. Any H.323-related message from the IP network is received on the IP Signaling Series 3 card and processed. If necessary, the message is translated and sent to the Matrix Controller.

2. Any host message destined for the IP network is sent first to the Matrix Controller, where it is processed and translated, then sent to the IP Signaling Series 3 card.

4. The Matrix Controller also handles all communication between the IP Signaling Series 3 card and the VDAC-ONE (or IP Network Interface Series 2) card.

5. The VDAC-ONE (or IP Network Interface Series 2) card is responsible for transmitting and receiving the IP RTP data stream.

The Excel platform acts as an H.323 gateway by connecting the PSTN to an IP network. In the Excel platform, any inbound PSTN call (for example, T1) is connected to the outbound IP network by connecting the VoIP channels and T1 channels. For example:

1. A caller with a traditional analog telephone dials the number of an IP telephone.

3. The Matrix Controller sends a Request for Service message to the host computer.

4. The host sends a Route Control message through the Matrix Controller to the IP Signaling Series 3 card.

Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.

The Matrix Controller Series 3 card is based on Motorola’s 750 PowerPC processor (68750). It is often referred to as the Matrix Controller.

A computer, attached to the Excel platform through an RS-232 or Ethernet link, from which you run the telecommunications application that controls the Excel platform.

The protocol used in most local area PC networks. Typically, most Ethernet networks support data transmission speeds up to 10 Mbps, but 100 Mbps is also possible.

ITU-T standard defines a set of call control, channel setup, and codec specifications for transmitting real-time voice and video over networks that do not offer guaranteed service or quality of service.

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.

Public Switched Telephone Network

Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)

Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).